gnu: python-djangorestframework: Rename to python-django-rest-framework.

* gnu/packages/django.scm (python-djangorestframework): Define as deprecated
alias for ...
(python-django-rest-framework): ... this new variable.
(python-django-filter)[native-inputs]: Adjust accordingly.
* gnu/packages/mail.scm (python-hyperkitty)[propagated-inputs]: Likewise.
* gnu/packages/patchutils.scm (patchwork)[propagated-inputs]: Likewise.

gnu/packages/django.scm

@@ -31,6 +31,7 @@
   #:use-module (guix download)
   #:use-module (guix git-download)
   #:use-module (guix build-system python)
+  #:use-module (guix deprecation)
   #:use-module (gnu packages)
   #:use-module (gnu packages base)
   #:use-module (gnu packages compression)
@@ -457,7 +458,7 @@ your code.")
            (lambda _
              (invoke "python" "runtests.py"))))))
     (native-inputs
-     (list python-django python-djangorestframework
+     (list python-django python-django-rest-framework
            python-django-crispy-forms python-mock))
     (home-page "https://django-filter.readthedocs.io/en/latest/")
     (synopsis "Reusable Django application to filter querysets dynamically")
@@ -1011,9 +1012,9 @@ Django projects, which allows association of a number of tags with any
 @code{Model} instance and makes retrieval of tags simple.")
     (license license:bsd-3)))
 
-(define-public python-djangorestframework
+(define-public python-django-rest-framework
   (package
-    (name "python-djangorestframework")
+    (name "python-django-rest-framework")
     (version "3.13.1")
     (source
      (origin
@@ -1047,6 +1048,9 @@ Django projects, which allows association of a number of tags with any
 provides features like a Web-browsable API and authentication policies.")
     (license license:bsd-2)))
 
+(define-public python-djangorestframework
+  (deprecated-package "python-djangorestframework" python-django-rest-framework))
+
 (define-public python-django-sekizai
   (package
     (name "python-django-sekizai")